Not only were there so many amazing performances on stage, there were also all of the unforgettable moments that happened backstage. From dance battles, to your favorite stars mingling and hanging out backstage together, take a look at all of the best moments from this year's iHeartRadio Jingle Ball below. Fans can also relive all of the amazing 2018 iHeartRadio Jingle Ball performances and more during an exclusive nationwide television special on The CW on December 16th at 8 p.m. ET/PT.

Shawn Mendes Gave His First Performance Following His First Grammy Nominations

There is nothing holding Shawn Mendesback. The same day the Canadian singer/songwriter found out he was nominated for two Grammy awards(his first Grammy noms ever!), he also played to a massive crowd at New York City's iconic Madison Square Garden during iHeartRadio Jingle Ball. During his set at Jingle Ball, Shawn performed a number of his biggest hits from his (now) Grammy nominated new self-titled album, as well as fan favorites from previous albums. Fans were treated to "Holding Me Back," "Lost In Japan," a "Use Somebody/Treat You Better" mashup, and "In My Blood." And, right before singing "In My Blood," he stopped to tell fans what a whirlwind day he had saying, "I feel like I've been walking on clouds all day. This is a perfect way to end the day."

Cardi B Talks Family During her First Performance Since Split From Offset.

Cardi B is not letting her personal life drama get in the way of her thriving career.

While she made no mention of her break-up during her 2018 iHeartRadio Jingle Ball Presented by Capital One performance, Cardi made it clear that she is focusing on her loved ones this holiday season, especially her soon-to-be five-month-old daughter Kulture, who will be celebrating her first-ever Christmas.

Camila Cabello and Bazzi Performed "Beautiful" Together For The First Time

Bazzi and Camila finally gave us the "Beautiful" performance we've been waiting for. The singers hit the iHeartRadio Jingle Ball stage for the first time togetherto perform their smash hit, "Beautiful" with Camila joining Bazzi for his action-packed set, and we have to say, their chemistry was off the charts. (Not to worry, we know they're just friends!)

As well all know, "I Want A Hippopotamus For Christmas" is the unofficial song of the holiday season. So, when Alessia Carahit the Jingle Ball, she put her own spin on the classic hit that was, dare I say... iconic! For her rendition of the holiday classic, Alessia switched things up by slowing the song down a bit to fit her ever-so-chill vibe. Her raspy tone also gave the song a different sound that had me wishing for an actual Alessia "I Want A Hippopotamus For Christmas" studio-recorded version.

Camila Cabello Literally Brought The House Down.

Camila came out the gate with a high energy performance of her hit "Never Be the Same." And let me tell you, that was just the start of my fandom. She then went on to absolutely slay my life with a performance of "Inside Out" and "Bad Things." (Did I mention her choreography was dang-near Beyonce level, seriously?) With her expert-level booty shaking paired her Miami swagger, Camila had me (and all those around me) doing a double take.

The Miami native slowed things down when she went into a mash-up ofElvis Presley's "Can't Help Falling" and her track "Consequences." To end her killer set, Camila brought the entire audience to its feet as she performed "Into It" and her mega-hit "Havana."

Calvin Harris Led An Enormous "Summer" Sing-Along ... in Winter

Winter is coming ... but not for Calvin Harris. Taking over New York City's iconic Madison Square Garden, the producer/DJ played a number of his biggest hits, including "Feel So Close," his Rihannacollaborations, "This Is What You Came For" and "We Found Love," his Dua Lipacollaboration, "One Kiss," his Sam Smith-featured single "Promises," and his hit "Sweet Nothing" featuringFlorence Welch. But, in the middle of the set, as people were dancing all throughout MSG, Calvin led an enormous sing-along to his hit song "Summer" (on which he sings). There's nothing like singing along to a summer song in the winter.

G-Eazy Surprised Fans with Marc E. Bassy

For his unforgettable set, G-Eazy ran down his long list of chart-topping hits and even brought out his fellow Bay Area native, Marc E. Bassyfor their collabs "Love Her Too" and "You and Me." The friends and collaborators brought the entire crowd to its feet as they fed off each other's energies during their incredibly hype set.

Khalid and Normani Were Absolute Friendship Goals

This year, Khalidteamed up with Normani to release their hit collaboration "Love Lies," and during the 2018 iHeartRadio Jingle Ballpresented by Capital One. Any fan of these two already know what great friends they are, but during their Jingle Ball performance, they were absolute (and adorably) friendship goals. Khalid kicked off the song and was later joined by Normani, who looked gorgeous in a winter white outfit.

MONSTA X's Backstage Dance Battle

MONSTA X became the very first K-Pop band to perform on the iHeartRadio Jingle Ball Tour. And while in NYC, they celebrated hard by dancing ... in an epic dance battle. Backstage, famed NYC dance group Waffle Crew was breaking it down backstage with all of the stars, and a few of the MONSTA X guys got into it, and showed everyone their best moves!

Photos: Getty Images, Todd Owyoung for iHeartRadio

102.7 KIIS FM's Jingle Ball

See the best moments from 102.7 KIIS FM's Jingle Ball Presented by Capital One held November 30, 2018 at The Forum!

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Ryan Seacrest Foundation

Every year, the Jingle Ball Tour gives back to the community to celebrate the holiday season. This year's official charity for the Jingle Ball Tour is the Ryan Seacrest Foundation. $1.00 of each ticket sold will be donated to the non-profit organization, which is dedicated to inspiring today's youth through entertainment and education focused initiatives.

Meet the headliners backstage for a great cause!Wish one of music's hottest acts a happy holidays in person, take a photo with them, and get four tickets to the show while benefiting the Ryan Seacrest Foundation.